CO2 capture using amine-functionalized bimetallic MIL-101 MOFs and their stability on exposure to humid air and acid gases

A series of polyethyleneimine (PEI)-impregnated MIL-101(Cr, Mg) adsorbents with different PEI loadings was synthesized in the present work. Although the surface area and pore volume of MIL-101(Cr, Mg) decreased significantly as the PEI loading increased, all the resulting composites exhibited a dramatically enhanced CO2 adsorption capacity at low pressures. Up to 20 wt% PEI loading, the CO2 adsorption capacity reached a competitive value of...